轴向冲击下环向加筋复合材料圆柱壳的非线性动力响应

采用半解析的方法，建立离散加筋圆柱壳模型，基于复合材料多层扁壳大挠度的剪切变形理论，利用Hamilton原理导出环向加筋复合材料圆柱壳的非线性运动控制方程；用Galerkin方法对空间变量进行离散，将位移和载荷展开为双级数，得到有关时间的常微分方程组，最后采用R-Kutta方法数值求解．通过算例，讨论了加筋肋骨几何参数、铺层角度、辅层方式、铺层层数等因素对动力响应的影响。

NONLINEAR DYNAMIC RESPONSE OF COMPOSITE CYLINDRICAL SHELLS WITH CIRCUMFERENTIAL STIFFENERS UNDER AXIAL IMPACT LOAD

A simple and efficient semi-analytic method to solve the nonlinear dynamic response of composite cylindrical shells with circumferential stiffeners under axial impact load is presented.Applying the discrete stiffened shells model,based on the composite shell's shear deformation theory,the motion equations of stiffened shells are deduced by using Hamilton's variation principle.The deformation of the shells as well as the load are both expanded in double series.The motion equations expressed by deflection are obtained with the Galerkin method,and numerically solved by R-Kutta approach.Examples are given for illustration.The effects of the geometric parameters of stiffeners,lamination angle,lamination forms,the numbers of lamination layers and hydrostatic pressure on the dynamic response of stiffened composite cylindrical shells are discussed.